\(\frac{27.18+27.103-27.102}{15.33+33.12}=\frac{27\left(18+103-102\right)}{33\left(15+12\right)}\)

\(=\frac{27.19}{33.27}=\frac{19}{33}\)

k nha

\(\frac{27.18+27.103-27.102}{15.33+33.12}=\frac{27.\left(18+103-102\right)}{33.\left(15+12\right)}=\frac{27.19}{33.27}=\frac{19}{33}\)

\(\frac{27.18+27.103-27.102}{15.33+33.12}=\frac{27.\left(18+103-102\right)}{33.\left(15+12\right)}\)

\(=\frac{513}{891}=\frac{19}{33}\)

\(\frac{27\cdot18+27\cdot103-120\cdot27}{15\cdot33+33\cdot12}\)

\(=\frac{27\left(18+103-120\right)}{33\cdot\left(15+12\right)}\)

\(=\frac{27}{33\cdot3}=\frac{27}{99}\)

\(=\frac{3}{11}\)

Đề bài : Tính

\(\frac{27.18+27.103-120.27}{15.33+33.12}\)

\(=\frac{27\left(18+103-120\right)}{33\left(15+12\right)}\)

\(=\frac{27}{33.27}\)

\(=\frac{1}{33}.\)

\(\frac{5.18-10.27+15.36}{10.36-20.54+30.72\left(not27\right)}=\frac{5.18-10.27+15.36}{4\left(5.18-10.27+15.36\right)}=\frac{1}{4}\)

\(\frac{\frac{-6}{7}+\frac{6}{19}-\frac{6}{31}}{\frac{9}{7}-\frac{9}{19}+\frac{9}{31}}=\frac{-6\left(\frac{1}{7}-\frac{1}{19}+\frac{1}{31}\right)}{9\left(\frac{1}{7}-\frac{1}{19}+\frac{1}{31}\right)}=\frac{-6}{9}=\frac{-2}{3}\)

\(A=\frac{7}{10.11}+\frac{7}{11.12}+\frac{7}{12.13}+...+\frac{7}{69.70}\)

   \(=7.\frac{1}{10.11}+7.\frac{1}{11.12}+7.\frac{1}{12.13}+...+7.\frac{1}{69.70}\)

  \(=7.\left(\frac{1}{10.11}+\frac{1}{11.12}+\frac{1}{12.13}+...+\frac{1}{69.70}\right)\) 

   \(=7.\left(\frac{1}{10}-\frac{1}{11}+\frac{1}{11}-\frac{1}{12}+\frac{1}{12}-\frac{1}{13}+...+\frac{1}{69}-\frac{1}{70}\right)\)

   \(=7.\left(\frac{1}{10}-\frac{1}{70}\right)=7.\frac{3}{35}=\frac{3}{5}\)

\(A=7.\left(\frac{1}{10}-\frac{1}{70}\right)\)

\(=\frac{6}{70}\)

\(=\frac{3}{35}\)

\(B=\frac{1}{2}.\left(\frac{2}{25.27}+\frac{2}{27.29}+...+\frac{2}{73.75}\right)\)

\(=\frac{1}{2}.\left(\frac{1}{25}-\frac{1}{75}\right)\)

\(=\frac{1}{2}.\frac{2}{75}\)

\(=\frac{1}{75}\)

=

\(\frac{27.18+27.103-120.27}{15.33+33.12}\)

\(=\frac{27\left(18+103-120\right)}{33\left(15+12\right)}\)

\(=\frac{27.1}{33.27}\)

\(=\frac{1}{33}\)

\(\frac{1}{33}\)

\(M=\frac{32}{323}\)                                                                                                                                                                                                                  \(N=\frac{86}{589}\)                                                                                                                                                                                                         \(\frac{M}{N}=\frac{496}{731}\)

Xem lại đề đi

thế đề như thế nào

=\(\frac{30\left(1+8+27+64+125\right)}{5\left(3+24+81+64+375\right)}\)

= \(\frac{30.225}{5.574}\)

=\(\frac{6750}{2870}\)

=\(\frac{675}{287}\)

K mình với!!!!

\(\frac{6\cdot7\cdot12}{18\cdot4\cdot7}\)

\(=\frac{6\cdot7\cdot4\cdot3}{6\cdot3\cdot4\cdot7}=1\)

\(\frac{15\cdot7\cdot9}{77\cdot3\cdot18}=\frac{5\cdot3\cdot7\cdot9}{11\cdot7\cdot3\cdot9\cdot2}=\frac{5}{11\cdot2}=\frac{5}{22}\)

chúc hok tốt

Trả lời

\(\frac{6.7.12}{18.4.7}=\frac{6.7.3.4}{6.3.4.7}=1\)

\(\frac{15.7.9}{77.3.18}=\frac{5.3.7.9}{11.7.3.2.9}=\frac{5}{22}\)

Học tốt

What các bạn làm theo dạng toán lớp mấy đấy 

ukm tôi được cũng có ý nghĩa ! 

tôi hiểu rồi ! 

a hi hi bây giờ mới hiểu thật ngốc ! 

=\(\frac{8.12+8.8-8.18}{8.10-8.9}\)

=\(\frac{8.\left(12+8-18\right)}{8\left(10-9\right)}\)

=\(\frac{8.2}{8}\)

=2